import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

///自带删除的ITextField
typedef void ITextFieldCallBack(String content);

enum ITextInputType { text, multiline, number, phone, datetime, emailAddress, url, password }

class ITextField extends StatefulWidget {
  final ITextInputType keyboardType;
  final int maxLines;
  final int maxLength;
  final String hintText;
  final TextStyle hintStyle;
  final ITextFieldCallBack fieldCallBack;
  final ITextFieldCallBack fieldSubmit;
  final Icon deleteIcon;
  final InputBorder inputBorder;
  final Widget prefixIcon;
  final TextStyle textStyle;
  final FormFieldValidator<String> validator;
  final TextStyle counterStyle;
  final String inputText;
  final bool autofocus;
  final TextInputAction textInputAction;
  final EdgeInsetsGeometry contentPadding;
  final FocusNode focusNode;
  final GestureTapCallback fileOnTap;
  final bool hasCancel;

  ITextField(
      {Key key,
      ITextInputType keyboardType = ITextInputType.text,
      this.maxLines = 1,
      this.maxLength,
      this.hintText,
      this.hintStyle,
      this.fieldCallBack,
      this.fieldSubmit,
      this.deleteIcon,
      this.inputBorder,
      this.textStyle,
      this.prefixIcon,
      this.validator,
      this.counterStyle,
      this.inputText = '',
      this.autofocus = false,
      this.textInputAction,
      this.contentPadding,
      this.focusNode,
      this.fileOnTap,
      this.hasCancel = false})
      : assert(maxLines == null || maxLines > 0),
        assert(maxLength == null || maxLength > 0),
        keyboardType = maxLines == 1 ? keyboardType : ITextInputType.multiline,
        super(key: key);

  @override
  State<StatefulWidget> createState() => _ITextFieldState();
}

class _ITextFieldState extends State<ITextField> {
  String _inputText = '';
  bool _hasdeleteIcon = false;
  bool _isNumber = false;
  bool _isPassword = false;
  FocusNode _focusNode = FocusNode();

  ///输入类型
  TextInputType _getTextInputType() {
    switch (widget.keyboardType) {
      case ITextInputType.text:
        return TextInputType.text;
      case ITextInputType.multiline:
        return TextInputType.multiline;
      case ITextInputType.number:
        _isNumber = true;
        return TextInputType.number;
      case ITextInputType.phone:
        _isNumber = true;
        return TextInputType.phone;
      case ITextInputType.datetime:
        return TextInputType.datetime;
      case ITextInputType.emailAddress:
        return TextInputType.emailAddress;
      case ITextInputType.url:
        return TextInputType.url;
      case ITextInputType.password:
        _isPassword = true;
        return TextInputType.text;
      default:
        return TextInputType.text;
    }
  }

  ///输入范围
  List<TextInputFormatter> _getTextInputFormatter() {
    return _isNumber
        ? <TextInputFormatter>[
            WhitelistingTextInputFormatter.digitsOnly,
          ]
        : null;
  }

  @override
  void initState() {
    super.initState();
    _inputText = widget.inputText != null ? widget.inputText : '';
    if (widget.focusNode != null) {
      _focusNode = widget.focusNode;
    }
    _focusNode.addListener(() {
      if (!_focusNode.hasFocus) {
        setState(() {
          _hasdeleteIcon = false;
        });
      } else {
        setState(() {
          _hasdeleteIcon = (_inputText.isNotEmpty);
        });
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    TextEditingController _controller = TextEditingController.fromValue(
        TextEditingValue(text: _inputText, selection: TextSelection.fromPosition(TextPosition(affinity: TextAffinity.downstream, offset: _inputText.length))));
    TextField textField = TextField(
      autofocus: widget.autofocus,
      focusNode: _focusNode,
      controller: _controller,
      textInputAction: widget.textInputAction,
      cursorColor: Theme.of(context).primaryColor,
      decoration: InputDecoration(
        counterStyle: widget.counterStyle,
        hintStyle: widget.hintStyle,
        hintText: widget.hintText,
        border: widget.inputBorder != null ? widget.inputBorder : UnderlineInputBorder(),
        fillColor: Colors.transparent,
        filled: true,
        prefixIcon: widget.prefixIcon,
        contentPadding: widget.contentPadding,
        suffixIcon: _hasdeleteIcon
            ? Container(
                width: 18.0,
                height: 18.0,
                child: IconButton(
                  alignment: Alignment.center,
                  padding: const EdgeInsets.all(2.0),
                  iconSize: 18.0,
                  icon: widget.deleteIcon != null ? widget.deleteIcon : Icon(Icons.cancel),
                  color: Color(0xFf727785),
                  onPressed: () {
                    setState(() {
                      _inputText = '';
                      _hasdeleteIcon = (_inputText.isNotEmpty);
                      widget.fieldCallBack(_inputText);
                    });
                  },
                ),
              )
            : Text(''),
      ),
      onChanged: (str) {
        setState(() {
          _inputText = str;
          _hasdeleteIcon = (_inputText.isNotEmpty);
          widget.fieldCallBack(_inputText);
        });
      },
      onSubmitted: (str) {
        setState(() {
          widget.fieldSubmit(str);
        });
      },
      keyboardType: _getTextInputType(),
      maxLength: widget.maxLength,
      maxLines: widget.maxLines,
      inputFormatters: _getTextInputFormatter(),
      style: widget.textStyle,
      obscureText: _isPassword,
      onTap: () {
        widget.fileOnTap();
      },
    );

    if (!widget.hasCancel) {
      return textField;
    } else {
      return Row(
        children: <Widget>[
          Expanded(
            flex: 1,
            child: Container(
                height: 34,
                padding: EdgeInsets.fromLTRB(20, 0, 0, 0),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.all(Radius.circular(100)),
                ),
                child: textField),
          ),
          InkWell(
            child: Container(
              padding: EdgeInsets.symmetric(horizontal: 15, vertical: 6),
              child: Text('取消', style: TextStyle(fontSize: 16, color: Colors.white)),
            ),
            onTap: () {
              Navigator.of(context).pop(true);
              // setState(() {
               
              //     _inputText = '';
              //     _hasdeleteIcon = (_inputText.isNotEmpty);
              //     widget.fieldCallBack(_inputText);
              //     _focusNode.unfocus();
               
              // });
            },
          )
        ],
      );
    }
  }
}